Air heater



AIR HEATER Filed Nov. 5. 1927 4 Sheets-Sheet l w i a \Q Sq &

1: I hi1 A 1/ INVENTOR BY 'J ATTORNEY$ March 8, 1932. D. s. JACOBUS AIRHEATER Filed Nov. 3

4 ShQetS- -Sheet 2 W/ INVENTOR ATTORNEYS March 8, 1932. 5, JACQBUS1,848,130

AIR HEATER Filed Nov. 3, 1927 4 Sheets-Sheet 3 Fig- 3 mZ/ZZ/ INV NTORAWQRNEYJ WWIM March 8, 1932.. 5, JACQBUS 1,848,130

AIR HEATER Filed Nov. 3. 1927 4 Sheets-Sheet 4 2 INVENTOR I ATTORNEYSPatented Mar. 8, 1932 it 1, :nnvrn sLJAco us. ornoiircmln, NewJERSEYQASSIGN R use-ism iaiiiicocka wired: V j

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"gap iiea'u zi filea n embrs, 192% serial 11 2303371 This inventionrelates to an air heater and I is a division in part ofmy applicationSerial" No. 571,919, filed June 30,- 1922 which has maturedfinto- Patent#1547397, [da'ted No-g ve'mber 8; 1927 The invention will be underejstood from the descriptionin connection withthe accompanyingdrawings, inwhich Fig.

1 is a vertical section through an illustrative embodiment of theinvention;'Fig. 2is a lo perspective view on an enlarged scale showingsomeof the details"; Fig. 3 is a vertical see- I tion through amodificatiomand Fig; 4 is a perspective view showing some of the detailsofFigL3.

5 of the well known typeythe hot gases from which pass through'a gasoutlet Sand down wardly over an economiz'er'7 into a flue 8., From thisflue, the hot. gases pass upwardly throu h afiue 9 aroundthe air heater;which is to e described more specifically herein In Fig. 1, I haveillustrateda steam boiler by two platesspacedapart a distancethat iSjsmall in proportion to thewidt-h of the plates;

andlthefwi dth' is small proportion to the length; I The spaces betweensuch tubes forni passages which are similar in shapeandgeneralproportionsto the tubes. The'space'sbea tweenthe upper ends offpairs otplates 2O' and 21 are closed'by horizontal strips 25 and thespaces-'between these strips 25-are left open; Alter nate spaces between thelower; j beveled ends of the plates and 21 "are closed; g I by inclinedclosure members 26, so'that' the olosures and-26 at opposite ends of theplates are stagger'ed'with respect to each" other. The spaces betweenthe plates 20 and 21 in the respective ducts-9 and llare closed .bystrips 27 along the central plane ofthe 7 air heater'and alternatespaces between'the'se plates 20 and 2 1 are left openfor a short dis;tancebelow'the-strips 25 so that air can pass air-heater, the airflowing upwardly through 3U" the-ducts oftheair heater and thenacross'a" below the strips 25 from one'duct 11 to the V other'duot 9. a"i lhe spacesbetween the edges of the plates 21 an'df22 near the lowerends are left open after, passing at thetop'thr'ough across flue lOwhichmay be of the form illustrated, and then downwardly through averticalflue 11 I V p a: to a gas outlet' fiue 12 which is con'nected infor sdme' distancei "as shown at, 28, corre-y the form illustrated tofafan 13 bywhich the I spondingtc the opensp cesbetwee t e s r ps gasesare'forced' toa stack 14. 25 -at the-top-,"sothat gases enter 'theair Afan 15 forces air through avflue 16 intoftheto" the longitudinal axis ofthe ducts and pass so;

horizontal connection, which will be described more fullyhereinafteminto'the second set'of V air ducts throu h'which theairpasses down-- Wardlyto analr'outl'et flue or duct17 from whichitmaybe supplied to a combustion chamber through an 'underfeed' stoker18",

which I have adopted'for purposes of n n 1 t ti fi; V

In the formillustrated, as inore'clearly shown in Fig.2, theairiductsareformed, of

metallic sheets placed side. by'side with the spaces between their edgesclosedto form gas tight joints; In the form illustrated in Fi'g.

f 2, each duct is made up of a; flat sheet metal. plate 20 and a similarplate 21 having its edges bent, as shown at 22- and 23 to provide'aspacing portion and a fastening portion,"the portion 23 being riveted to theedges of theplate u 20, as "shown at This constructionformsflatt'ubes'spaced apart; Each tubeis formed between thefstri'ps '25'intothe cross fluelO,

thence downwardly between corresponding plates in the duct 11, andthence outWardIy through the spaces 28. A pocket 29 (Fig; I) Ibelowtheoutletfi is so located andshaped 85,

as" to provide 'a reverse -bend;for7thegases, with theresult' thatthe'gases enter'the heater .in such'a direction that theywill bewelldistributed across the spaces between; the plates without-crowding too.inuch to one side and leaving inactiveportions. 'The gases fi'owindownwardly over-the economizer 7 an through the flue impinge against thelower inclined wall of thedust hopper'29 and are deflected upwardly in'such away that the gas stream makes a less 'angle'withthe' longestcenter line-"of the passageway in thefiuid heater than does the inclinedwall opposite 'the opening thro'ugh which the gases enter;

As the gasesfloiw upwardly from" the bottom 7 idO of the hopper 29, theyassume a generally fan-shaped form, the axis of which more nearlyapproachthe longest center line of the heater than does the wallopposite the entrance opening. This construction causes the gases to beevenly distributed across the passages from front to rear of the airheater; It will be apparent that where the gases are introduced at aright angle tothe longest axis'of-the air heater, then the gases pileupagainst the wall opposite the opening against which the gases areintroduced, with the result that there is an unequal distribution'of themass flow of the gasesthrough d flerent portions of the passage wh1chleads to a less eflioient heat. transfer than in the case of ap plicantsdevice where the gasesare evenly,

distributed. Also the air entering through the inlet. 16 is travelingin-the direction it will-take in passing through the spaces in the duct11; a

vIn the modificationshown iirFigs. 3 and i, the gases from theeconomizer 7 passthrough the pocket 29 andthence enter the air heater 30that is provided withhorizontally extending spaced plates, as shown indetail in Fig.1

4. The upper and lower edges of the plates 31 and 32 are bent so as tocontact with each other, as shown at 34, in pairs, thus leaving spacesbetween the pairs for the passage of the hot gases and spaces betweentheplates ofthe pairs for the passage of air to be heated. The hot gasesare caused to enter in the directionof the longitudinal axis of the airheater,

so that there is good distribution of gases withoutgcrowding to one sideand the air is also caused to enter in a similar manner from,

the other end of the air heater. The spent gases pass at one end airpasses out through spaces 36 alongthe opposite side at the other end ofthe air heater.

iL-In an air heater, flat tubes and spaces between them tormingpassageways for air andla heating gas, respectively, means fordiresting-one of the fluids into said passageways substantially in thedirection of the longest center. line of said passageways, and aninletopening for the other fluid in theside of the heater, the wall of saidheateropposite said opening being inclined to said longest center line,the angle between the stream flow otthe other fluid: through saidopening; and said longest center line of said heater beingless than thatbetween said wall and said longest center line.

2. In an air heater, flat'tubes and spaces between them formingpassageways for air and a heating gas,respectively, means for di rectingoneof the fluids into saidapassageways substantially'in the direction ofthe longest center line of saidpassageways, an inlet openingfor theother fluid intheside of the heat v thedirectionof the longest centerline out through spaces 35 ;onone side of the air heater andthe heated'3. In air-air heat "r, 'flattubesand spaces be tween them formingpassageways for air and i a heat ng gas respectively, means fordirecting" one of said fluids into its passageways in of saidpassageways and an inlet opening for the other fluid inthezside oftheheater, thewall of said heater opposite said openingbein'g inclin'ed' tosaid longest; center line, the anglebetween the stream flow of the-otherfluid" through said opening and said longest center line ofsaidzheaterbeing less than that between s'aid wall and said longestcenter" line, with said fluidsflowingcountercurrenta 4C. In anairheater, flat tubesand spaces be tween them tormingpassageways for airand a heating gas, respectively, means for directlng one of saidfiuidsinto-itspassageways 11L the'direction of: the longest centerline of saidpassageways and an outlet openingifor the other fluid in the side of theheater,the wall of said heater opposite said opening; being inclined tosaid longest center1ine,the angle between the stream flow of the otherfluid through said opening and said longest center? line of saidheaterbeing less than that between, said wall and said longestcenter line,with said fluids flowing" countercur-rent, said last named meanscomprising apocketlocated' near the entrance tosaid passageways '5. Inan air heater, flat tubes andspaces between them forming passageways forair and a heating gas, respectively,- means for directing one 1 of said.fluids into its passageways in the direction of theilongestvcenter lineof said: passageways and: means fordi? recting the. other fluid into itspassageways-I substantially in the opposite direction along;

said center line, with saidfluids-flowingcountercurrent,sa1d last namedmeanscomprising a pocket located in the portionofthe flue ap--proachingsaid air heater 6. In an air heater, flat tubes andspaces:

between them tormingpassageways for air andal heating gas, respectively,meansfor directing one of the fluids into said passages wayssubstantially in the direction of the;

longest center line thereof, and means comprising a dust hopper located:in the flue apiproachingsaid air heater for deflecting the stream flowof the other fluid and causing it to enter the air heater substantially.in thedirection of the longest center line vor said-passa eways.

tweenthem forming passageways for air and a. r In an-a1r heater,'flattubes andspacesbe I ing inclined to said longest center line, the

' fluid through said opening and said longest center line of said heaterbeing less than that a heating gas, respectively, means for direct ingone of the fluids into said passageways v I substantially in thedirection of the longest center line thereof, and an inlet opening forthe other fluid in the side of said heater, the

wall of the heater opposite said opening beangle between the stream flowof the other between said wall and said longest center line.

8. In an air heater, flat tubes andspaces be- Y 1 tween them formingpassageways for air and a heating gas, respectively, means for.direct-f;

ing one of the fluids into said passageways substantially in thedirection of the longest I center line ofsaid passageways, means fordirecting the gases over the heating surface of a steam boiler'and thenthrough an inlet opening in the side of the heater, the wall of theheater opposite said opening being inclined to said longest center line,and a soot hopper located in the portion of the flue V where thepassages approach the air heater for directing the gas stream flowsubstantially in the direction of the longest center line of saidpassageways.

DAVID 's. JACOBUS. j; g i

